Fuel drain valve for engines



Feb. 15,-1944.

J. H. CARPENTER 2,341,758 FUEL DRAIN VALVE FOR ENGINES Filed April 17,1943V Patented Feb. 15, 1944 FUEL DRAIN VALVE FOR ENGINES John H.Carpenter, Williamsport, Fa., assigner to The Aviation Corporation, NewYork, N. Y., a corporation of Delaware Application April 17, 1943,Serial No. 483,513

16 Claims.

The invention relates to automatic fuel drainvalves for superchargedinternal combustion englnes.

One object of the invention is to improve the construction of automaticfuel drain-valves for use with supercharged engines, which insures theclosing of the valves during the operation of the engine and its openingfor draining the liquid fuel from the intake manifold when the engine isstopped.

Another object of the invention is to provide a valve of this type whichcomprises a casing which is composed of abody, cap and intermediatesections with the movable elements all mounted in the intermediatesection to facilitate the assembly, inspection or repair of saidelements.

Another object of the invention is to provide a valve of this type whichis simple in construction, eflicient in operation, and can be producedat la low cost.

Other objects of the invention will appear from the detail description.

The invention consists in the several novel features which arehereinafter set forth and more particularly defined by claims at theconclusio hereof. v

In the drawing:

Fig. 1 is a section of a valve embodying the invention.

Fig. 2is a section taken on the line 2-2 of Fig. 1.

Fig. 3 is a section taken on line 3 3 of Fig. 1.

Fig. 4 is a plan view of the valve.

Fig. 5 is a perspective of the intermediate casing-section in which themovable valve member and the piston for shifting said member aremounted.

Fig. 6 is a side elevation of the valve.

In the exemplication of the invention illustrated, the casing comprisesa body-section, a cap-section, and an intermediate section which isremovably secured between the cap and body sections and in which theoperating vparts of the valve `are mounted. The body-section I0 ispreferably made of aluminum or magnesium, is oupshaped, and comprises atop wall II)a and an annular depending wall Il in which is formed acylindrical chamber i2 which extends through the lower end of wall II.vA duct I4 extends obliquely and laterally from the upper end of chamberI 2 and lcommunicates with a pipe I5 which is usually connected to theinlet to the impeller between the carburetor and the impeller of thefuel supercharging system of an internal combustion engine, so thatsuction will be applied to the upper end of chamber I2 at all times whenthe engine is in operation. The body-section I0 is provided with anintegral pad I6 and laterally extending lugs I'I which are provided withholes for screws and are faced for attachment of the valve-casing to aface on the intake manifold through which the fuel is forced by theimpeller or supercharger to the engine-cylinders, so that any liquidfuelin said intake and its connections after the engine is stopped willdrain into a duct I8. The duct I8 extends to the face or pad I6 toreceive the liquid fuel from said manifold and its lower end is extendedas at I9 into communication with an annular groove 2E) in the lowerportionof` the chamber I2. The duct I8, while the engine is running, issubjected to fluid pressure from the combustible mixture forced throughthe manifold by the impeller or supercharger (not shown). Thisexemplifies a chamber, the upper end of which is subjected to suctionfor closing the automatic drain valve and the lower end to pressurewhile the engine is running.

The cap-section 2l is also preferably made of aluminum or magnesium,forms a bottom for the casing, and is provided with a chamber 22 whichreceives the engine fuel drained through the body-section of the casingand an outlet duct 23 to which a pipe 24 is connected for delivering thedrained fuel to a reservoir for re-use. Section 2l is provided withintegral lugs or ears 25 which are provided with holes for screws 26which are adapted to removably secure the capsection t0 the body-sectionof the casing.

The'intermediate casing-section, which is preferablyvmade of steel orother wear-resistant material, comprises a cylinder 21 which fits incylindrical chamber I2; an integral annular iiange 28 which fits and isadapted to be clamped between cap-section 2l and the lower face on theannular wall Il of the body-section and is provided with holes throughwhich screws 26 extend; a cross-wall 3i) which is provided withdrainholes 32a, and a downwardly `facing conical valveseat 32. Ports 29are formed in the lower portion of cylinder 2l for the ow of fluid underpressure from lduct I8 and groove 2B into the lower end of saidcylinder. A ring of packing 33 in a groove in the inner periphery ofwall II prevents leakage between the upper and lower ends yofcylindrical chamber I2.

A piston 34 is slidable in the cylinder 2'I above the pressure ports 29and below the suction duct I4, so that the upper piston face isresponsive to suction from duct I4 and the under face will be responsive.to pressure from duct I8. A valvemember 35 is adapted to close againstseat 32 and is provided with a stem 36 which extends through and isslidable in the crossewall 30. Piston 34 is fixedly secured on the upperend of valve-stem 36 between a shoulder on the stem 36 and a nut 31, sothat said piston will shift the valve-member 35 to and from its seat 32.A coil-spring 38 betweenpistn, 34 and the wall yIlisaisadapted to shiftpiston'd downwardly to unseat valve-member 35 and permit the fuel todrain through ports or holes 32a into chamber 22 when pressure andsuction are not applied to the piston 34, which occurs when the engineis not running. This construction exemplifies one in which the pistonand valve-member are mountedwin Fandare'rethe suction in duct M from theinlet side of the impeller 91' beiweenihe carburetor and .the im- -pllerwill @applied toiheuppef; face .of piston 3.4- esimlllienelll', fluidunder :pressure from `duct i8, which is-connected to thel inlet manifoldthrough the eombustiblemixture isforcedto the engine-cylinders bytheimpeller, will pass-through brenchduct la annular-www12, and ports 28into theI lower rend of cylindeigzland against the underside@ Piston.SG- This suctionand pres- ,sure en vthe-pistondit -will overcometheforce of spring Sdand shift the piston upwaidly and force thevalve-member 35 agains-tits seat V3,2to -cut off communication betweentheinterior Iof cylinder 2'I .and-the chamber -22 and duct-2.3 intheucapsection 2 l. -Whenthe engine sfstoppedfih-epres- 5111181011thevunder-sdeandfihef suction-.on its 11p- -perjfface will be releasedand thes-pring til-will shift Ithe piston 3c downwardly and the latterWilhunseat valve-member 35. Any residualv liquid Vfuel or any condensateofthe fuelwill then drain from the manifoldthrough ductl, extension t9,groove 26, ports 29 into thecylinder `2 and thence through ports 32a,chamber 2,2 `andpducts `23 to the drain pipe Zillwhich conducts the fue]to any suitable .point for 11e-use, -i-f desired. While the engine isnot running, the `valve remains `open for draining the Ifuel. As soon asthe engineis started, piston "Sdwvill beshif-ted to yclose valvememberv35 and eut oif communication between the chamber12'2 and thevinletmanifold.

The invention exemplies a fuel drain valve for engineswhichis simple inconstruction andefcient and automatic in its operation. The-constructionis adapted for the use of an intermediate section ofwear-resisting metal Yfor carryingthe voperating parts andtop and bottomcasing sections of lighter metals. flheoperating partsare readilyremovable for replacement, 'inspection .or repair, because they are allmounted in the intermediate casingfsection. The valve-casing is smalland is adapted for direct connection to the intake manifold.

The .invention is not to be understood Vas restricted to the detailssetforth, since-these may be modified within the scope of the appendedclaims without ydeparting from the .spirit and scopev of the invention.l

Having thus described Vthe invention, what I claim as new and desire ltosecure by Letters Patent is:

`1.,-A fuel drainvalve for supercharged vengines .comprising `a casinghaving actin-shaped bodysecrtvioun and a separate cap-section; thebody-sleciionrbeiue provided with e cylindrical chamber, aduc .havingenopenfendfierqrmeiion .touis y,0f which is in communication with thesuction duct and the lower end of which is in communication `with thepressure and drain duct; a crosswall at the lower en d of the cylinderprovided with V'a valve-seat and a drain-opening; a piston slidnableinthe cylinder between the suction and pressure ducts withits facesadapted to be exposed .tosuction and pressure, respectively; avalvemember for engaging the seat and cutting off the flow through theopening in said wall; a connection, :between the piston v.and :saidYralvevmember and eXtendng th-rouehthe wall.; and. means forautomatically shifting the piston to unseat said valve-member when'thepiston is not subjected to suction and-pressure.

Y2- vA rfuel .dra-in valve `for ,supercharged engines comprising acasing havine fa cup-.Shaped :body section and ,aseparate-fcapfsecticn;the Abodysection being provided with a cylindrical chamber, a ducthaving an open end for connection to duid pressure from -thepintake:manifold when the engi-ne is running -and 'for Adraining liquid fuelfrom themanifoldwhen-the engine is-stopped and Communicating :with einelower v:portion of t :Said chamber, and duct vcommunieating With theupper portion :0f the `;cha-mbleltand connectedfor suction'frornthekergside of-the=i1npel1er or supercharger :theic .pfsctionbeing-provided with a chamber andan outletgductffor thefuel; a cylinderin said cylindrical chamber, the upper end of vwhich is in communication:with `thesuction duct and the lower end;-of;which1is;inccmmunicatiQn--;with .the pressure and drain duct; a crosswallat'the-vlower end ofi thecylinder provided with V adownwardly'facingValve-seat and with drain-ports; a piston slidable in thecylinderbetween the suction and pressure .ducts with its farcesadapted-to be exposed to. suctionf andv pressure, respectively; avalve-member under land'for engaging the seat and cutting 01T theflowthrough the drain-ports in said wall; a stem xedly connectingthe pistonand said valve-member and extending throughthe wallyand'means forautomatically shifting the piston t-ounseat said .valvemember whenthepiston-is not subjected-to suction and pressure.

3. A fuel drain-valve for supercharged engines comprising a casinghaving a cup-shaped bodysection and -a separate cap-section; :thebodysection being providedwitha cylindrical :chambena duct having anAopenend -forvconnection to fluid pressure -from the `intake manifoldwhen the engine Vis running and "for draining liquid fuel from themanifold-when the engine'is stopped and communicating with the upperportion of the chamber and connected-forsuction from/the intake side ofthe limpelleror -supercharger; the ap-fsection Kbeing lprovided with achamber and an outlet duct for the fuel; a cylinder in said Cylindricalchamber, the upper end of Vwhich is in communication with the suctionduct and the lower end of which is in communication with the pressureand drain duct; packing around thevcylinder between the pressureandsuction ducts; a eresswall at the lower end -of the.cylinderfprovided with a valve-seat and with a drain-opening; a pistonslidable in the cylinder between the suction and pressure ducts, withits faces adapted to be exposed to suction and pressure, respectively; avalve-member for engaging the seat and cutting off the flow through theopening in said wall; a fixed connection between the piston and saidvalve-member, and extending through the wall; and spring means forautomatically shifting the piston to unseat said Valve-member when thepiston is not subjected to suction and pressure.

4. A fuel drain-valve for supercharged engines comprising a casinghaving a cup-shaped bodysection and a separate cap-section; thebody-section being provided with a cylindrical chamber, a duct having anopen end for connection to fluid pressure from the intake manifold whenthe engine is running and for drainingr liquid fuel from the manifold`when the engine is stopped and communicating with the lower portion ofsaid chamber, and a duct communicating with the upper portion of thechamber and connected for suction from the intake side of the impelleror supercharger; the cap-section being provided with a chamber and anoutlet duct for the fuel; a cylinder in said cylindrical chamber, theupper end of which is in communication with the suction duct and thelower end of which is in ccmmunication with the pressure and drain duct;a

crosswall at the lower end of and integral with the cylinder, providedwith a downwardly facing valve-seat and with drain-ports; a pistonslidable in the cylinder between the suction and pressure ducts with itsfaces adapted to be exposed to suction and pressurevrespectively; avalve-member under and for engaging the seat and cutting olf the flowthrough the drain-ports in said wall; a stem fixed between the pistonand said valve-member and extending through the wall; and spring meansfor automatically shifting the piston to unseat said valve-member whenthe piston is not subjected to suction and pressure.

5. A fuel drain-valve for supercharged engines comprising a casinghaving a cup-shaped bodysection and a separate cap-section; thebody-section being provided with a cylindricaly chamber, a duct havingan open end for connection to fluid pressure from the intake manifoldwhen the engine is running and for draining liquid fuel from themanifold when the engine is stopped and communicating with the lowerportion of said chamber, and a duct communicating with the upper portionof the chamber and connected for suction from the intake side of theimpeller or supercharger; the cap-section being provided with a chamberand an outlet duct for the fuel; a cylinder in said cylindrical chamber,the upper end of which is in communication with the suction duct and thelower end of which is provided with ports in communication with thepressure and drain duct; a crosswall at the lower end of the cylinderprovided with a downwardly facing valve-seat and with the drain-ports; apiston slidable in the cylinder between the suction and pressure ductswith its opposite faces adapted to be exposed to suction and pressure,respectively; a valve-member in the chamber in the cap-section, underand for engaging the seat and cutting off the flow through thedrain-ports in said wall; a fixed connection between the piston and saidvalve-member extending through the wall; and a spring between the pistonand the top of the body-section for automatically shifting the. pistonto unseat said valve-member when the piston is not subjected to suctionand pressure.

6. A fuel drain-valve for supercharged engines comprising a casinghaving a cup-shaped bodysection and a separate cap-section; thebody-section being provided with a cylindrical chamber, a duct having anopen end for connection to pressure from the intake manifold when theengine is running and for draining liquid fuel from the manifold whenthe engine is stopped and communicating with the lower end of saidchamber, and a duct communicating with the upper portion of the chamberfor connection to suction from the intake side of the impeller orsupercharger; the cap-section being provided with a chamber forreceiving liquid from the body-section, and an outlet duct for theliquid; a cylinder in said cylindrical chamber, the upper end of whichis in communication with the suction duct and the lower end of which isin communication with the pressure and drain duct, the cylinder beingprovided with a flange tting between the body and cap sections; a crosswall on the lower end of the cylinder which is provided with avalve-seat and a drain-opening; screws extending through the cap-sectionand said flange, for detachably securing the cap-section and flange onthe body-section; a piston slidable in the cylinder between suction andpressure ducts, with its opposite faces adapted to be exposed to suctionand pressure, respectively; a valve-member for engaging the seat forcutting off the ow through the drain-ports in said wall; a connectionbetween the piston and saidvalvemember extending through the wall forshiftingV the valve-member from the piston; and means for automaticallyshifting the piston to unseat said valve-member` when the piston is notsubjected to suction and pressure. l

'7. A fuel drain-valve for supercharged, engines comprising a casinghaving a cup-shaped bodysection and a separate cap-section; thebodysection being provided with a cylindrical cham` ber, a duct havingan open end for connection to pressure from the intake manifold when theengine is running and for draining liquid fuel from the manifold whenthe engine is stopped and communicating with the lower end of saidchamber, and a duct communicating with the upper portion of the chamberfor connection to suction from the intake side of the impeller orsupercharger; the cap-section being provided with a chamber forreceiving liquid from the body-section and an outlet duct for theliquid; a cylinder in said cylindrical chamber, the upper end of whichis in communication with the suction duct and the lower end of which isin communication with. the pressure and drain duct, the cylinder beingprovided with an integral flange fitting between the body and capsections and an integral cross wall which is provided with a valve-seatand drain-ports, screws extending through the capsecticn and said flangefor detachably securing the cap-section and flange on the body-section;a piston slidable in the cylinder between suction and pressure ductswith its opposite faces adapted to be exposed to suction and pressure,respectively; a valve-member in the cap-section for engaging the seatfor cutting olf the flow through the drain-ports in wall; a stemconnecting the piston and said valve-member and extending through thewall for shifting the Valve-member from the piston; and means forautomatically shifting the piston to unseat said valve-member when 'thepiston is not subjected to suction and pressure.

8. A fuel drain-valve for supercharged engines comprising a casinghaving a cup-shaped bodysection and a separate cap-section; thebodysection being provided with a cylindrical vchamber, a duct having anopen end for connection to pressure from the intake manifold when theengine is running -and for draining liquid fuel from the manifold whenthe engine is stopped and communicating with the lower end of saidchamber, and a duct communicating with the upper portion of the chamberfor connection to suction from the intake side of the impel-ler orsupercharger; the cap-section being provided with a chamber .forreceiving liquid from the body-sect-ion and an outlet duct for theliquid; a cylinder in said cylindrical chamber, the upper end of whichis open and in communication with the suction duct and the lower end ofwhich is provided with a port in communication with vthe pressure anddrain duct, the cylinder being provided with a flange fitting betweenthe body and cap sections and a cross wall which is provided with avalve-seat and drain-ports; packing around the cylinder between itsupper and lower ends; screws extending through the cap-section and saidflange 'for detachably securing them on the body-section; a pistonslidable in the cylinder between suction and pressure ducts, with itsopposite faces adapted to be exposed to suction and pressure,respectively; a valve-member for engaging the seat for cutting off theflow through the drain-ports in said wall; a connection between thepiston and said valve-member extending through the wall, for shiftingthe valvemember from the piston; and means for automatically shiftingthe piston to unseat said valvemember when the piston is not subjectedto suction and pressure.

9. A fuel drain valve for supercharged engines comprising a casinghaving a cup-shaped bodysection and a separate cap-section; thebodysection being provided with an integral pad adapted to t and to besecured against a portion of an intake manifold, a cylindrical chamber,a duct having an end open at the pad for connection to pressure from theintake manifold when the engine is running and for draining liquid fuelfrom the manifold when the engine is stopped and communicating with thelower end of said chamber, and a duct communicating with the upperportion of the chamber for connection to suction from the intake side ofthe impeller or supercharger; the cap-section being provided with achamber for receiving liquid from the body-section and an outlet ductfor the liquid; a cylinder in said cylindrical chamber, the upper end ofwhich is in communication with the suction duct and the lower end ofwhich is in communication with the pressure and drain duct, the cylinderbeing provided with an integral fiange fitting between the .body and capsections and an integral cross wall which is provided with a Valveseatand drain-ports; screws extending through the cap-section and saidflange for detachably securing the cap-section and ange on thebodysection; a piston slidable in the cylinder between suction andpressure ducts with its faces adapted to be exposed to suction andpressure, respectively; a valve-member for engaging the seat for cuttingoff the flow through the drain-ports in said wall; a connection betweenthe piston and said valve-member extending through the wall for`shifting the valve-member from the piston;

and means for automatically shifting the piston to unseat saidValve-member when the piston is not subjected to suction and pressure.

10. A fuel drain-Valve for supercharged engines comprising a casinghaving a cup-shaped body-section and a separate cap-section; thebody-section being provided with a cylindrical chamber, a duct having anopen end for connection to pressure from the intake manifold when theengine is running and for draining liquid fuel from the manifold whenthe engine is stopped, an annular groove communicating with the lowerend of said pressure and drain duct and a duct communicating with theupper por-l tion of the chamber for connection to suction from theintake side of the impeller or supercharger; the cap-section beingprovided with a. chamber for receiving liquid from the bodysection andan outlet duct for liquid; a cylinder in said cylindrical chamber, theupper end of which is in communication with the suction duct and thelower end of which is provided with ports in communication with thegroove in the body-section, the cylinder being provided with a flangefitting between the body and cap sections and a cross wall which isprovided with a downwardly facing valve-seat and drain-ports; screwsextending through the cap-section and said iange for detachably securingthem on the body-section; a, piston slidable in the cylinder betweensuction and pressure ducts with its opposite faces adapted to be exposedto suction and pressure, respectively; a Valve-member for engaging theseat for cutting off the ow through the drain-ports in said wall; afixed connection between the piston and said valve-member extendingthrough the wall for shifting the valvemember from the piston; and aspring for automatically shifting the piston to unseat said valve-memberwhen the piston is not subjected to suction and pressure.

11. A fuel drain-valve for supercharged engines comprising a casinghaving a body-section and a separate cap-section, said body-sectionhaving a chamber opening through one wall thereof, a duct having an openend for connection to iiuid pressure from the intake manifold and fordraining liquid fuel from the manifold, said duct opening into one endportion of said chamber, a duct communicating with the other end portionof said chamber and connected for suction from the intake side of thesupercharger, said cap section having a chamber opening through one wallthereof and having an outlet opening through a second wall, saidlast-named outlet being communicatively connected to said cap-sectionchamber, a hollow member having oppositely extending open end portionsand extending into said chamber, said hollow member having a valve seatat one open end portion thereof, a piston slidable in said hollowmember, said hollow member having its other open end portioncommunicatively connected with said chamber other end portion, meanscommunicatively connecting said chamber one end portion with said hollowmember one end portion intermediate said piston and said seat, a valvemember cooperable with said seat to control flow of fluid therethrough,means securing said cap-section to said body-section with saidcap-section chamber registering with said hollow member one end portion,means operatively interconnecting said valve and said piston, and meansurging said valve away from said seat.

12. A fuel drain-valve for lsupercharged engines comprising a casinghaving a body-section and a separate cap-section, said body-sectionhaving a chamber opening through one wall thereof, a duct having an openend for connection to fluid pressure from the intake manifold and fordraining liquid fuel from the manifold, said duct opening into one endportion of said chamber, a duct communicating with the other end portionof said chamber and connected .For suction from the intake side of thesupercharger, said cap section having a chamber opening through one Wallthereof and having an outlet opening through a second wall, saidlast-named outlet being communicatively connected to said cap-sectionchamber, a hollow member having oppositely extending open end portionsand extending into said chamber, said hollow member having a valve seatat one open end portion thereof, a piston slidable in said hollowmember, said hollow member having its other open end portioncommunicatively connected with said chamber other end portion, meanscommunicatively connecting said chamber one end portion with said hollowmember one end portion intermediate said piston and said seat, a valvemember cooperable with said seat to control flow of fluid therethrough,means securing said cap-section to said body-section with saidcapsection chamber registering with said hollow member one end portion,means operatively interconnecting said valve and said piston, guidemeans for said interconnecting means, and means urging said valve awayfrom said seat.

13. A fuel drain-valve for supercharged engines comprising a casinghavinga body-section and a separate cap-section, said body-sectionhaving a chamber opening through one wall thereof, a duct having an openend for connection to iiuid pressure from the intake manifoldand fordraining liquid fuel from the manifold, said duct opening into one endportion of said chamber, a duct communicating with the other end portionof said chamber and connected for suction from the intake side of thesupercharger, said cap section having a chamber opening through one wallthereof and having an outlet opening through a second wall, saidlast-named outlet being communicatively connected to said cap-sectionchamber, a hollow member having oppositely extending open` end portionsand extending into said chamber, said hollow member having a valve seatat one open end portion thereof, a piston slidable in said hollowmember, said hollow member having its other open end portioncommunicatively connected with said chamber other end portion, meanscommunicatively connecting said chamber one end portiony with saidhollow member one end portion intermediate said piston and said seat, avalve member cooperable with said seat to control flow of fluidtherethrough, said hollow member having a flange portion, means securingsaid cap-section and said angeportion to said body-section with saidcap-section chamber registering with said hollow member one end portion,means operatively interconnecting said valve and said piston, guidemeans for said interconnecting means, and means urging said valve awayfrom said seat.

14. In a device of the character described, a body member having achamber opening through one Wall thereof, a duct opening into one end ofsaid chamber away `from said one wall, a duct opening into said chamberadjacent said one wall, a hollow member positioned in and havingsubstantially a fluid tight nt with said chamber, a

nange on said hollow member abutting said body one wall, a transversewall closing the end of said hollow member adjacent said iiange andhaving an aperture therethrough, a pressure responsive member positionedin said hollow member, means communicatively interconnecting said secondnamed duct with the interior of said hollow member intermediate saidpressure member and said transverse wall, a valve member cooperable withsaid wall aperture to control flow of fluid therethrough, meansoperatively connecting said pressure member and said valve member, a capmember having a chamber opening through one wall thereof, said capmember having an outlet passageway leading from said last-named chamber,said cap member one wall abutting said flange, said last-named chamberregistering with said wall aperture, and means securing said cap memberand said hollow member to said body member.

l5. In a device of the character described, a body member having achamber opening through one wall thereof, a duct opening into one end ofsaid chamber away from said one Wall, a duct opening into said chamberadjacent said one wall, a hollow member positioned in and havingsubstantially a fluid tight fit with said chamber, a ange on said hollowmember abutting said body one wall, a. transverse wall closing the endof said hollow member adjacent said flange and having an aperturetherethrough, a pressure responsive member positioned in said hollowmember, means communicatively interconnecting said second named ductwith the interior of said hollow member intermediate said pressuremember and said transverse wall, a valve member cooperable with saidwall aperture to control flow of fluid therethrough, means operativelyconnecting said pressure member and said valve member, guide means forsaid connecting means, a cap member having a chamber opening through onewall thereof, said cap member having an outlet passageway leading fromsaid last-named chamber, said cap member one Wall abutting said flange,said last-named chamber registering with said wall aperture, and meanssecuring said cap member and said hollow member to said body member.

16. In a device of the character described, a body member having achamber opening through one wall thereof, a duct opening into one end ofsaid chamber away from said one wall, a duct opening into said chamberadjacent said one wall, a hollow member positioned in and havingsubstantially a fluid tight ht with said chamber, a ange on said hollowmember abutting said body one wall, a transverse wall closing the end ofsaid hollow member adjacent said flange and having an aperturetherethrough, a piston member positioned in said hollow member, meanscommunicatively interconnecting said second named duct with the interiorof said hollow member intermediate said piston member and saidtransverse wall, a valve member cooperable with saidwall aperture tocontrol W of uid therethrough, means operatively connecting said pistonmember and saidvalve member, a cap member having achamber openingthrough one Wall thereof, said cap member having an outlet passagewayleading from said last-named chamber, said cap member one wall abuttingsaid ange, said last-named chamber registering with said wall aperture,and means securing said cap member and said hollow member to said bodymember.

JOHN I-I. CARPENTER.V

